Answer:
Short run $250
Long run $280
Explanation:
Short-run:
TR = PxQ = 27x10 = $270
VC = TC – FC = 280 – 30 = $250
Bob should continue his lawn-mowing service in the short run because his total revenue is higher than his variable cost.
Long-run:
TR = $270
TC = $280
Bob should therefore exit the market because his total revenue is lesser than his total cost.